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SMTnet Express April 18, 2013, Subscribers: 26335, Members: Companies: 13359, Users: 34594

Effect of Silicone Conformal Coating on Surface Insulation Resistance (SIR) For Printed Circuit Board Assemblies

by: Carlos Montemayor; Dow Corning Corporation

Conformal coatings are considered a method of providing corrosion protection to electrical assemblies used in high-humidity or harsh environments(...) Increased miniaturization of new circuit board designs requires flexible, low stress coating material to protect delicate components and fine-pitch leads. Silicone conformal coatings offer many advantages that address the general trend of ongoing PCBs designs, such as: high flexibility and low modulus to reduce stress on delicate or small components(...)

The goal of SIR testing is to identify possible failures in the functioning of printed circuit boards due to electro-chemical failure mechanisms, such as unacceptable electrical leakage under high humidity conditions, corrosion and metal migration, before they can occur on actual parts in the field. Results from this SIR testing are reviewed and discussed through this paper.

First published in the 2012 IPC APEX EXPO technical conference proceedings.

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